POSTing json data with php cURL

<?php
$params = array(
    "id" => 1,
    "name" => "Pritom Kumar Mondal"
);
$param = json_encode($params);
$ch   = curl_init("http://localhost/api_server/user");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, $param);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/json',
    'Content-Length: ' . strlen($param))
);
$response = curl_exec($ch);
print_r($response);
?>